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06-13-2008, 09:26 PM   #91
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Location: Wellington, New Zealand
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s/n: 9010305

(probably the earliest serial number of all the lenses listed here; bought from Photography and Electronics Stores - We are experts in all the products we sell. )

good! slightly soft at the corners at f/2.8, but otherwise excellent throughout on the K20d.

06-14-2008, 10:47 AM   #92
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9021501 -- seems to be good at first sight, a bit soft wide open at 16mm in the corners. Bought at fotokonijnenberg, turnhout, belgium.

Seems like the newer 902... serials are all good up to now.

update
--------

I uploaded some testshots. Could someone with a good copy take a look and tell me if I got a good one?
Picasa Web Albums - Beau - DA* 16-50 f2....

Last edited by Beau; 06-15-2008 at 05:28 AM.
06-16-2008, 03:39 AM   #93
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QuoteOriginally posted by Beau Quote
Seems like the newer 902... serials are all good up to now.
??? That's not what I would conclude reading back through the posts...

R
06-16-2008, 04:57 AM   #94
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QuoteOriginally posted by Reuben0 Quote
??? That's not what I would conclude reading back through the posts...

R
You are correct, some bad 902s are reported in the later pages.

06-20-2008, 04:20 PM   #95
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9018278 from Beach Camera (6/13) seems good so far, apart from a little stickiness in the zoom action at 28mm going from 16->50.
06-23-2008, 12:40 PM   #96
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Mine's fine

Hi fellow pentaxians,
as it seems is my lens a good one. It's somewhat soft on the edges at f2.8, but generally I'm happy with it.
SN: 9014560
Greetings from southern Bavaria,
Peter
07-08-2008, 02:15 PM   #97
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Posts: 102
Updated list:

9010305 - GOOD
9011024 - GOOD
9011133 - GOOD - used from a forum member
9011582 - GOOD - from Amazon
9011592 - GOOD - from Digital Depot
9012114 - GOOD -
9012269 - GOOD - from a Pentax retailer in Helsinkiin October
9012537 - GOOD -
9012359 - GOOD - bought locally
9012509 - GOOD
9012541 - BAD - from Amazon, beginning of January
9012612 - BAD - from Keeble and Shuchat in Palo Alto, CA (focus is fine, but suffered mechanical failure)
9013067 - GOOD
9013124 - BAD
9013251 - GOOD
9013254 - BAD
9013269 - GOOD - from ACE Photo - Northern Virginia
9013490 - BAD - aperture problem
9014xxx - BAD - slight de-centering and trouble focussing at 50mm (Reuben0)
9014376 - BAD - back focus
9014560 - GOOD
9014888 - GOOD
9015311 - BAD
9015662 - GOOD - from National Camera and Video, Edina, MN.
9015921 - BAD - from a hometown store
9016333 - BAD
90163xx - BAD - reported by daacon
9016410 - GOOD - from CameraWarehouse.com.au
9016499 - GOOD
9016508 - GOOD
9016577 - GOOD - from Henry's
9016531 - GOOD
9016652 - GOOD - from McBain Camera
9016761 - BAD
9017115 - GOOD
9017198 - GOOD - purchased in Vancouver, Canada
9017292 - BAD - from B&H
9017473 - GOOD - from a local store in Canada
9017525 - BAD - So it's a BAD copy on K10D, but a GOOD one on K20D
9017549 - GOOD - from Digit-Photo in December
9017856 - GOOD
9018018 - BAD - from Amazon (new, first owner)
9018018 - GOOD - from Amazon (refurbished, second owner - fixed by Pentax?)
9018137 - BAD - from Amazon03-17-2008
9018176 - BAD - from Adorama
9018278 - GOOD - from Beach Camera
9018380 - BAD - from B&H
9018546 - GOOD
9018897 - BAD - from Amazon (now that Pentax fixed it, it's GOOD)
9018946 - GOOD -
9019078 - BAD - from Adorama (not very good, focus at 16/2.8 unreliable)
9019218 - GOOD - from Adorama
9019284 - GOOD - from Adorama
9019306 - BAD - purchased in Vancouver, Canada.
9019329 - GOOD - from Adorama
9019346 - BAD - from Willoughby's (originally reported as good, but now refuses to focus)
9019612 - GOOD
9019818 - GOOD
9020266 - GOOD
9021116 - GOOD - from B&H (focusing may be "a tad off")
9021117 - GOOD
9021232 - GOOD - from Willoughby's
9021501 - GOOD - from fotokonijnenberg, Turnhout, Belgium.
9022439 - GOOD - from Calumet NYC
9023236 - GOOD - from SRS Microsystems
90233xx - BAD - total rubbish in the corners unless stopped down to F16 (Reuben0)
9023463 - GOOD - from buydig
90244xx - BAD - corner softness, tested briefly in the shop (Reuben0)
9024876 - BAD

Prog.
07-08-2008, 02:37 PM   #98
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Bought today 9020323 in Fotobesenicar - Slovenia for now looks good I hope also in the future...

07-08-2008, 03:43 PM   #99
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9021570 is OK. Bought it from Beachcamera a week ago. Did a few crude tests.
07-08-2008, 06:52 PM   #100
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Thanks Prognathous.

Any more nicks to the Bad lenses? or is Reuben0 the only "unlucky" guy?

When people repeatedly find "bad lenses" i wonder if it says more about the lenses or the users.
07-08-2008, 07:10 PM   #101
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Posts: 94
QuoteOriginally posted by GoSharks Quote
9018278 from Beach Camera (6/13) seems good so far, apart from a little stickiness in the zoom action at 28mm going from 16->50.
I have experienced the same situation. The lens seems to be good so far. There is some stickness (a little) near 28mm. I bought this lens from B&H. My previous one from Abes Of Maine was bad and I had to return it. The serial number is 9025709

One thing I noted is this serial number seems to be from the 2008 batch and my previous 16-50 got from Abes was 2007 batch..

-IU
07-13-2008, 12:50 PM   #102
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Posts: 83
Update

9013490

Received the lens from repairs a week ago, problem has been fixed. I did not perform a thorough IQ test yet.
07-14-2008, 10:17 AM   #103
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not sure, really soft though.

9029381, received just today from Adorama.
Not too sure. Focus is lovely quiet, but it seems soft @ 2.8. Can anyone with a good lens post a sample? here's one (K10D):
100iso, 2.8, 1/50, 50mm (100% crop).
@16 it is noticeably better. What do you guys think?
Attached Images
 

Last edited by fishy; 07-14-2008 at 10:27 AM.
07-14-2008, 10:22 AM   #104
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That's a 100% crop? Can we see the full image?

Note that @ 50mm + f/2.8 is this lens's weakest spot - Need to see the whole image,
but I'm thinking it's probably OK. Especially for a 100% crop...
07-14-2008, 11:49 AM   #105
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not full crop

Sorry, my bad, was no 100%. Misread dimensions...

But I think you're right. I also have a really soft Sigma 28-70 2.8, but I don't use it anymore. Maybe I'm too careful (or worried, it'd be hell to send it back to the States)
Next try (image converted from RAW, no sharpening):
Focus is on the grey-ish book, 'Ethica' for the top, 'Dover' on the bottom crop
Top: Center-center, Bottom: center-bottom

The girl was taken @ 50mm, 1/100, iso 100, the eye is a 100% crop (really, this time)

So where shall I put 9029381? Good or bad? I'm still not decided
Attached Images
View Picture EXIF
PENTAX K10D  Photo 
View Picture EXIF
PENTAX K10D  Photo 
View Picture EXIF
PENTAX K10D  Photo 
View Picture EXIF
PENTAX K10D  Photo   

Last edited by fishy; 07-14-2008 at 01:53 PM.
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